The river surface used to be covered with waste and rubbish is now taking on a new look.A.

问题补充：

The river surface used to be covered with waste and rubbish is now taking on a new look.

A. of which

B. along with

C. where

D. whose

答案：

A. of which

B. along with

C. where

(答案→)D. whose

解析：whose+名词, 引导定语从句, whose在句中作定语。whose surface相当于the surface of which。